Abstract: Objective Through the investigation and detection of the hazards of chlorine in a chemical enterprise in Qarhan Salt Lake in Qinghai Province,to understand the level of chlorine gas exposure in the workplace of the enterprise,clarify the key control areas and key points,discuss the control and treatment measures of chlorine gas hazards,and provide reference for the management of chlorine gas hazards in similar chemical enterprises in the salt lake area. Methods From July 2022 to April 2023,a investigation and testing of chlorine gas occupational hazard factors in a chemical enterprise in Qarhan Salt Lake in Qinghai Province were carried out according to relevant occupational health standards,and the exposure concentration of workers was quantitatively analyzed according to the results.Improvement control measures were taken for the excessive items,and the improvement effect was verified and analyzed. Results A total of 5 workplaces were tested,with 1 point exceeding the concentration limit and the rest meeting the requirements. The chlorine treatment workshop exceeded the limit with a concentration of 1.34-1.81 mg/m³,and the occupational exposure limit was 1 mg/m³,with the highest exceedance rate of 81.00%. After taking improvement measures,the concentration of chlorine gas decreased from 1.81 mg/m³ to 0.19 mg/m³,with a decrease rate of 89.50%,which met the requirements of occupational exposure limits. Conclusion Chemical enterprises in Qarhan Salt Lake area should pay close attention to the leakage of chlorine gas from equipment corrosion,take special engineering protection measures to control chlorine gas hazards in combination with local environmental conditions,create safe production environmental conditions,and effectively protect the occupational health of workers.

Key words: Qarhan Salt Lake, Chemical industry, Chlorine gas hazards, Identification and detection, Control measure